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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ea1944a419e711ad5f955bc980fa3879e7bc0b92e5b8ba60e12b24adb1a1ad' 
  AND token = 'hNx/PrBOOtD8pJDezn5nCrtOBj8gcwsmlrXZlEN1wCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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