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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e9d83ee89f2ce8314a8acd2599339a61d4e6ae31175e19be7531e3c717687e' 
  AND token = 'ABHMn4jvQZCbhFZobcpS68/ZOliR2CdifBTx0tps2fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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