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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975c1d936ac006d0d341cab27f95c6903127b6f2670c025badbe1f4505b29d50' 
  AND token = 'lgdORVUx5JxbJ2kdoLmM8iB2kJE2Hy4qTSudjDclzzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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