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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954ee2fe41a0cacca8e363157d5052081c7035d0fb3ad37dce5258062c7f8bc3' 
  AND token = 'udJYWt+QXMyWuXzOd+j5oARf9XUOqiuPKL5oWwgbh3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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