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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68ded9083d03c7ff23335e4c675836997e3936ef07744c47beddfce90df5643' 
  AND token = 'U2RRs0ggkdJZPE63NSV6E3DWiaoT0flW9FCD4n2tOGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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