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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f911a4e2691e0b328e056c6d7bfd5d35b279b4415e83556f0de324a83850b72a' 
  AND token = 'pU8H0WyNH6vWCE3TZ5xjHYpahB2LT119FNxP3i8JAtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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