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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f05b8ba563d210c1db441ac72f9eb3af92a7a4d2a5cc9e49ec5e77dd6b9075' 
  AND token = 'mfY1M5+I90fAdg3xJe/HhkFCYcSTvccBVE4XyuqrvNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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