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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b173b3a3e432849fb05232e083bde14821015b18092836cee7b9c03334391a6' 
  AND token = 'NRlaC5mRRow+19pHsf1M7GdbVSq8QOrq4AMWsymmA8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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