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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3309a6db6333c031216e46770676446c88e606e737f94f49278d53194d589be9' 
  AND token = 'xrUFKrGJquaGgpEnrS8UeOa2LN2helkR4Y+nZNFLUbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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