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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e29fd61aa2b3acda6ed049d7682589eb51c72dc47a1503ecb8f0bb0008dae8b' 
  AND token = 'jEVC2jIDEMAYsVhKvrtNJBu5p5MBk9V70MkN36snGR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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