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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2a6a912df6b5d3455f0bbc7305dc88d30a449c6fc09f2bbcbc2fda15e10164' 
  AND token = 'ehhZx8zMI5J7lpdrPmvoQ3kRSj3SJ6D6hQU/Jn1nGEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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