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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62189112473b9cb6a17b541c64fc3a22db8c33204b7d404f591f11b494d69889' 
  AND token = 'dte+wy5WLKqFbDP8zayFH4epNC6jij1Ch0ewAQ4d744=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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