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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f10c6f2dc72a92a0d5198029ef98314b78a7cef857abb3d45931c6255d60558' 
  AND token = 'AVgdzI8dUjk0SSuQ0X5w70VZl3RARAtIOLAA3M6/Ms0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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