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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5aca51d42113f7b5909aa3ce0e8ed4db45ee0f778e02cefd345e5bf6a6cc57d' 
  AND token = 've/cxQ4n7/2Bx2a+qHbuFT9w+CJV/YLz2VkO6R/na0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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