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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a337e0bf48b01012265cf90eb6c5113893caa18d8b3f73bf5da5d1af0a674b58' 
  AND token = 't9gquWvIwasTQBvuNDfwFxQG9b2QOuBNICJ8cH1f2xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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