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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedacff4cca47755c2373bb0790060c63d71ac85609f7a244a78858942e846a7' 
  AND token = 'x1xaoq1+CRF808ufBMDz/wA2sskWwr3BDgc9Al44ftE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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