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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f8081c3d01a0330dfc675c4a3c278d5472546de39b0cf90c4d77265171779b' 
  AND token = '3k64ageobjyqUqe0H+zaUG3syqQnFH6a/e7/6NZHi6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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