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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b41040d32527fb97bd44be11a8a1e3af403330c11de19b05926dc8de0bd1f3' 
  AND token = 'J+QX020tdretusDRT4HoFa5YGd5BAxXLl7PtNNTslQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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