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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc84404c59ebf5984aeae22dc604fd76a4dfde9b6e15da4ce8ebc17fcde7608' 
  AND token = 'toakxlFl37xUn4UXLFkc+6Q6clUCNXW+0SxBi/1orz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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