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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f99115dfba30e72f7b46ed0bf0c4d5dc1e223ec1b795b199c1ecc5d3a38f7a' 
  AND token = '3RkHjGRty26vqSgiHh6PvRvRTSyRHOGSyqZJG0+NvPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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