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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbe46b98d2a2fc0a36ac649efd2e97e01947a3afa7bf3cdf6d7717528c660d0' 
  AND token = 'MVcNkMlgqHaG9YUxrpV4iUeZMdUufSsp8Al6OGIJfsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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