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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82486c2d5bd98d6533daf11f942fe409dcda31481c8404d0a39e3597b2fc6f6' 
  AND token = 'Kd9ISaNhE8QrWh8tcVzycVTmyFmTBGp1msQiXil1PMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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