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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409adc4dc8b811a0d54440b89b9fda16ce60f3f83a8e2b19513ea1cd9b57bd24' 
  AND token = '03XedCqB5qWshYD5qg4knp7+CROtNtnZijXCLiCmmMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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