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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bdf1c43fae871555b70097387d23abbc630ae98fe079d49c53a146d4718e59' 
  AND token = 'uMn77AHj/94EIojj1367YZZOBNmpFyHe8+v9wuigE10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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