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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd5c2b16e2cbe0137cf74cf3ef7e8c618914ac35408a81ba3838249583473a3' 
  AND token = 'YBQ0BcCJZrXvtTpR3m3yj0eeMfYRjkrQkhtTEFF0IH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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