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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0172b0cdf465b01bc28e52318aeb3575fa28117514624e18e7177ca6bacc5af5' 
  AND token = 'JYyRyC8IkkpZ5MpvMeNSlIBv3hsl27P1WCBCvsYS/Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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