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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c055b013138a8d6b6674378cf7137cac804d7cfb3cdb310207df9f7072313eaf' 
  AND token = 'o3kXGGfKVJJf1JLGh7HhWddqG+JyCyFjbIWk78r8BvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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