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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de66c5477e245ec12b5974475fba47a98cb98187ea488cccd01979e3b57856db' 
  AND token = 'PYuGncIF7vBHkaAIho8LIGpPeHZ+oezaP46vHqez9/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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