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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cc492c92d6d9c60d29fd047e0cd745e8b6bbea7703b34f1222e6440d01acf2' 
  AND token = '0UUHUSxWBx68h+AQrkIJAO3iH3iZyrA4E9mIP/1voT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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