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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c726e115ea6b05fbb07160250127ed056f12b33758578c888664f395b4670b' 
  AND token = 'M2RYJvXm2pUrRgvWc1a1Rsle3Fosm0Rr5qUl33lLjoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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