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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941f1fff33895ffe34643c573001a433b0b724417179e3b839817d036117bbcc' 
  AND token = '+Nu+VhF4v1PrLih2TTj9ezO1dPqPZAdqA8FoayRB5lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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