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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e690412287046b04e97f0d8812b5aab05cacb7bfc64af2dea1e4a650782b20' 
  AND token = '7KuEM5LL8RvzdCGCFxYslfsyQzmh4j61zwSrXgLXfEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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