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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3e930d97640c4da7360a8fddd58751e6e95099f5314333d36a360df87fa4f8' 
  AND token = 'Orsehj+ZQkXPpwYRf/csKE7sT6lNrYV6IDDXrflwk8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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