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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5485ea7720d71452d766f8779609e0b40cb27ba90498a5485ee7817ec5ecc2fb' 
  AND token = 'bouRnUTKg+1yWewH1T9lFbufHM44DxRZZ9PRl+0vCfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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