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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeab3e475d5ed98a81e29af2e087a05a82bc4b9d66d94dccd624728b6f8d1e3e' 
  AND token = '/rDsnNOT3mm8D5bwrbWVxclnzfO93bkZn6gtorKGXAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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