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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a93f87b9857f574d8c40a142326f1430f7c063fd2a49de31bc17b8ce013dcd9' 
  AND token = 'DwKlltbDCXNG1O6MJaWjd+cmXnraUkc4IjEAFkWn/Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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