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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcd77a3674d9aac421864afceab65e927d15abdbf17f34512caa1db60983231' 
  AND token = 'CjW47tZ6MuRk9Xbz1Ta70ngURBSIUB+eiVF7LfaAz7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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