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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383a59eb7f067eb13c00c434514e789e1719166a9d33f0dfa7b942fa25a7587b' 
  AND token = '/Z07CEUzVd3b5oGECGB0L+zX/MvXX2itrSYb+ctdDn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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