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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7b9ba7f5ff70182f925935ebec5fe73b1f0d20319cf3ffa7b2f1448760be7a' 
  AND token = 'q5ga3JP1NmMoPro9wuvI52LbkQ9xMPh0bmxrI3oOg8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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