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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8ca5612535bd192c5d1c2ac18aa78d455708fd956fdaa589cde524843209c6' 
  AND token = 'KNlcVoKAeq2oj7M7PNH7KCf1dkxqwB5On/sww8zCIw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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