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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd745314f936738aed3ae10d58a2a83b33c6dc510b9ae36d52911cdcb21321dfe' 
  AND token = 'HWt7bYxzdVC7VJLXDYsLFwgOUjPE6A+VxdhbuixdURg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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