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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cfa35df20d970a8c640a7f8d3a7568f869b03b20ec38c3576e8999cbb015a3' 
  AND token = 'UQLdNi+DpUqto00eIUy7m+HT7ClQn1mjo8xanUHNURg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}