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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb3544b632e330123f3b0a30f1d479494c99d2251dd05457f5cf75173334ff8' 
  AND token = 'r3d/HhnfNX2hD+EeU9BZTk96MODucG4nyjpMGoJrjGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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