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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6299c065d1cf0ee4d8cb8d4df67a51dede4d4b5cb0c72a2d4331c774e70c5d2' 
  AND token = 'L6OPImyy2kxWHGlzkrxpySKrugMo2McqZ9839sxQABc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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