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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329f767b2c13fff9abe0600f385d21bbd190a44f46fd12c20b2eee56bd60f0e3' 
  AND token = 'Mz98+NwgX/3V1Yb6nhsHB781v11++z4AumulAZX73ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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