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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5144ca1a7f70199bec4329db86e065ab495496c0d75f28cb633f6deeefe68d0e' 
  AND token = '815v7VXXDH4iQ9hCRnD+R7jhMOUqt3D63YjdCCxDMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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