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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c897ded46a042e76b76b5ce73b1e7b1610268ff43a7aec3c08679fc814ecb59b' 
  AND token = 'l7jKKL2v4GhQlMe2pMszunedRIi8KA+ipCpKYQJwp4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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