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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817b2695b4836da9cefc43ed80ea204a69e951830e51a14afb0a254809f960f0' 
  AND token = 'MHuKrl0vgsShGJiKbOsr8F6UzKSaa+044tW09jESIeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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