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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0207738f88b4cef90eacdc128a393d878db51d7ee76503b5cf649e374e9518' 
  AND token = '25aZy15J4SstZEs/wRAURQnSxdkgDNpNNsj3BK6OdEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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