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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cc63ff8228f07deb6e3851dfaa9d7ee9b90d29aebefb7e9807527530c9b965' 
  AND token = 'AJJfQZ0ZADYSU8J7Hq3drFIRmc8xPj2YxufowzUgpDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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