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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5d803283d1065e701319cbf615eba5927afbd83af3bef189137738d060a19d' 
  AND token = 'U0dzd6iZTs4xE9joNvvLae47Fg0wDctBaK9PTskR9oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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