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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506a03d136530cc30c611c4951d6a385271afe797f6a41dc61821e76ac333432' 
  AND token = '0xfoyuvyZPsiRmG/UwTnuiwbGAcRAsJAra1Qlot+RSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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