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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cf701d15ec5d5a5aebbd584608349e7aabedbacaf381183d96baa3db7b9bec' 
  AND token = 'yQqH5009NxFJOBaDNzqLAFr+Qo1MJapLUa6aV9FqYWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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