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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e10b6677c1c3bcaf9a9b07d10203be96c0a3f5343f57ebddc35ee9c29ccc520' 
  AND token = 'IBtz/ZM38UWvhbLm6uni91WpbPpzD8WzDbKYolCMGsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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