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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08361124a6b6b634b64988fa3ea68e9596521cd8aaea87ec5db04fe060c2ce05' 
  AND token = 'BWXwGuLYd8Vy7yaSLluNu0LsFaOe8JSdOm8jyLdESU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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