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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4094add195fc2f3b9808e640902d8ef56ad39cc38257f1ff985b7c172ad035eb' 
  AND token = 'IJlykV3sSE4qSLI6GRwKBVTOla3ja4mBHQqoKar6GTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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