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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e9c130f70c447529b7f6c06bc065e5b83b0a55b7366ac41ec7f3e544bc3a58' 
  AND token = 'ZVEsYCy9B1JcLO6Rup/A/9fQzxvUj39/22jDuf5xrbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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