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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7410ad5841efa59690c398a7d37428203e4c409c908deef57d5cd3800fe1521' 
  AND token = 'tgGCTuUR9K0BgvJDO/is5O7AheHB9GZq45Cglg4cCy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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