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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411e487f2e88e620618375a3242fd7c25062bb745ea8b471366a0002585d7c14' 
  AND token = 'PdHCq1FONsZl71kaprZGn4aYz2T7JF78ybk3sX43J5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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