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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876a2cc228173da41584b76e6f3a4a6e68f3ba36a360b81f6a281947d92e7c3a' 
  AND token = '/xOmRqXMqzn/1Jtyw/tuHdV+dGyr07FcYUzjzbx7R4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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