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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15b27b33294bd940116f876feea2d6ed53a0dee8c3e78993e508bee7dc78a60' 
  AND token = 'pa5iyg2YNAMx8RjXPzHdessvPLUnd8SnS/u3ePVxb9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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